Most people who use meth
in extended binges hear voices and see things during those
binges. These hallucinations lead to extreme anxiety and
paranoia. The combination of hallucinations and feelings of
fear and paranoia is known as meth-induced psychosis. Meth
induced psychosis is caused by meth’s effect on at least
three areas of the brain: the visual cortex, the auditory
cortex, and the amygdala.

For most people, these psychotic episodes pass when they
stop using and get some sleep. In some severe cases, the
symptoms can persist for days. In a very few cases,
meth-induced psychosis can be longterm and possibly
permanent.